Two equations, two unkowns.
Treat the equations as a system of two equations with two variables.
That should remind you about how you learned to solve systems of equations in algebra, recall that procedure and apply.

Use one of the equations to express v2 in terms of v1 (or vice-versa). Now replace the v2 in the other equation with this expression. This will yield an equation for v1 alone. Solve for v1, and finally solve for v2 using the equation for v2 in terms of v1.